Detector



FIG. 1 is a front view of a detector;

FIG. 2 is a rear view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view therof.

The broken lines depict environmental subject matter only and form nopart of the claimed design.

CLAIM The ornamental design for a detector, as shown and described.